It's even possible she didn't use any of the fabric and might be reluctant to bring it up in case your feelings might be hurt.
It's perfectly reasonable to call her and say you were thinking of her (true), wondered whether the fabric you contributed was used (also true), and could you arrange with her to retrieve the ones not used (true again).
As far as being paid for the fabric she used, I would let that slide. I'd be satisfied to have back the ones not used, my compromise if I felt I wasn't clear enough in the beginning. Once you have called to remind her, she either acknowledges an obligation or she doesn't value your friendship. At that point, you know where she stands - values what you have more than who you are to her.
I have a sister with a habit of trying to take advantage of me, and in the end we aren't close. I love her, just don't love the things she does to me. And I can only manage my behavior, not hers.
Call her and settle your mind about where you stand, then move forward.